Iron Deficiency Anemia Treatment Guidelines

First-Line Treatment

The American Gastroenterological Association recommends oral iron supplementation as the first-line therapy for most patients with iron deficiency anemia due to its simplicity, low cost, effectiveness, safety profile, and ability to be modified for better tolerance 1, 2, 3
Oral iron supplementation is effective in replenishing iron stores when taken for 3 months after correction of deficiency, with a recommended dose of ferrous sulfate 200 mg twice daily 2, 3
The absorption of oral iron can be enhanced when combined with vitamin C (250-500 mg twice daily) 1, 3

Intravenous iron is indicated in patients who do not tolerate oral iron therapy, have inadequate response to oral iron, or have conditions where oral iron absorption is impaired, such as active inflammatory bowel disease, post-bariatric surgery, or celiac disease 1, 4, 5, 6
The American College of Gastroenterology recommends IV iron for patients with severe or symptomatic anemia, ongoing blood loss, or functional iron deficiency in chronic kidney disease patients on erythropoietin therapy 1, 4, 7

The choice of IV iron formulation should be based on the ability to replace iron deficits with 1-2 infusions, with available options including ferric carboxymaltose, iron sucrose, and iron dextran 1, 2, 4, 8
Iron sucrose is typically administered at a dose of 200 mg per dose over 10 minutes, while iron dextran can provide complete replacement in a single infusion but carries a higher risk of serious reactions 2, 4

All IV iron formulations carry similar risks, including complement activation-related pseudo-allergy and true anaphylaxis, although the latter is very rare 1, 9
Resuscitation facilities should be available when administering IV iron, and patients should be monitored for 60 minutes after initial infusion 2, 7

In patients with inflammatory bowel disease, IV iron is recommended when active inflammation compromises absorption, and treatment of active inflammation can enhance iron absorption 1, 5, 10
In patients with chronic kidney disease, IV iron is preferred in hemodialysis patients, and consideration should be given to IV iron when TSAT ≤20% and ferritin ≤100 ng/mL 7
In patients who have undergone bariatric surgery, IV iron is recommended for those with iron deficiency anemia, particularly after procedures that disrupt duodenal absorption 1, 6

After normalization of hemoglobin and red cell indices, monitoring should be performed every 3 months for 1 year, then after another year, with additional oral iron provided if hemoglobin or red cell indices fall below normal 2, 3